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- N J Cerf, S Iblisdir, G Van Assche
- 2001

The cloning of quantum variables with continuous spectra is investigated. We define a Gaussian 1-to-2 cloning machine, which copies equally well two conjugate variables such as position and momentum or the two quadrature components of a light mode. The resulting cloning fidelity for coherent states, namely F = 2/3, is shown to be optimal. An asymmetric… (More)

A transformation achieving the optimal symmetric N-->M cloning of coherent states is presented. Its implementation requires only a phase-insensitive linear amplifier and a network of beam splitters. An experimental demonstration of this continuous-variable cloner should therefore be in the scope of current technology. The link between optimal quantum… (More)

The impossibility of perfectly copying ͑or cloning͒ an unknown quantum state is one of the basic rules governing the physics of quantum systems. The processes that perform the optimal approximate cloning have been found in many cases. These " quantum cloning machines " are important tools for studying a wide variety of tasks, e.g., state estimation and… (More)

- S Iblisdir, D Pérez-García, M Aguado, J Pachos
- 2008

A study of the thermal properties of two-dimensional topological lattice models is presented. This work is relevant to assess the usefulness of these systems as a quantum memory. For our purposes, we use the topo-logical mutual information Itopo as a " topological order parameter ". For Abelian models, we show how Itopo depends on the thermal topological… (More)

- N J Cerf, J Fiur´ašek, S Iblisdir, And S Massar
- 2002

A recursive method for producing path-entangled states of light is presented. These states may find applications in quantum lithography and high-precision interfer-ometric measurements. The required resources are single-photon sources, linear optics components, and photodetectors. Adding a quantum memory greatly enhances the yield in comparison with the… (More)

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